New smart multi‐ended differential solution for power networks. Issue 15 (14th September 2018)

• Record Type: Journal Article
• Authors: Teoh, Chee Pinp; Jesus, Joao; Richards, Simon; Ha, Hengxu
• Is Part Of: Journal of engineering. Volume 2018:Issue 15(2018)
• Page Start: 1109
• Page End: 1113
• Publication Date: 2018-09-14
• Subjects: power transmission lines -- synchronisation -- compensation -- power transmission faults -- relay protection -- power transmission protection; line current differential protection -- Kirchhoff's current law -- vector sum -- line end -- protected zone -- current vectors -- time compensation -- ping‐pong measurement -- propagation time delay -- smart multiended differential protection -- capacitive current compensation technique -- protection relay -- transmission system topology -- hybrid lines -- protection operating time -- capacitance current compensation -- distributed line parameter model -- multiended line differential protection -- smart protection concept -- integrated protection -- network topologies -- power networks -- smart multiended differential solution -- fault detection; Engineering -- Periodicals; Engineering; Electronic journals; Periodicals; 620.005
• DOI: 10.1049/joe.2018.0236
• Languages: English
• ISSNs: 2051-3305

Abstract

Abstract : Line current differential protection is based on Kirchhoff's current law calculating the vector sum of the currents from each line end to detect faults in the protected zone. For synchronisation of the current vectors, time compensation with a ping‐pong measurement of the propagation time delay is used. A new smart multi‐ended differential protection is presented in this study, which includes a new capacitive current compensation technique. The protection relay is scalable for any transmission system topology including hybrid lines. The protection is based on RMS values calculated from samples making it immune to frequency variations and the protection operating time is sub‐cycle. The protection uses an accurate algorithm for capacitance current compensation with a distributed line parameter model, where only the impedance and admittance per unit are required. This technique has an error <1% even considering transients in the algorithm. The need to provide connections to new renewable generation has increased the need for a multi‐ended line differential protection. This new smart protection concept is a step forward in providing reliable, cost effective and integrated protection for these new network topologies.